I don't think golem MR matters since it was the same for all tests? If anything, with no tash and high MR it helps mitigate the possibility that charisma is hidden behind already squelched resists. You'd just have to keep in mind you'll get lesser returns on mobs with low MR if tash already nullified all potential resists.
It is known mob level and MR has an effect on charm duration, here I think the level difference really shows and makes some "room" for charisma to do something. I hypothesized you might see no return on charisma on very low level mobs since the level difference is so big it nullifies any possible resists anyway. On a higher mob with resists that aren't buried under tash/level difference charisma could help. It seems to follow the logic of AC mechanics too so it wouldn't be a wild idea.
It is also known charm duration seems to nosedive past 50 due to level gap closing in. This tracks with what we already knew; past that point you can't squelch the mob's resists entirely.
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